Question

How to sort by numbers a mixed pair of string and number elements in a list with Scala

Answer 1

def extractNumber(s: String): Int = {
  val pos = s.lastIndexOf(" ")
  
  s.substring(pos + 1).toInt
}

val lst = List(
  "Python 4", "C 9", "C++ 5", "C# 6",
  "Java 1", "PHP 7", "Go 2"
)

val sorted = lst.sortBy(extractNumber)

println(sorted)



/*
run:

List(Java 1, Go 2, Python 4, C++ 5, C# 6, PHP 7, C 9)

*/

 

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